Paul,
   Because I do not know how to add dimension lines to a photo I
have enclosed a picture of my practice firewall. The dimensions are:
A) 22.50" between upper engine mounts
B) 20.25" between lower engine mounts
C) 17.25" between upper / lower engine mounts
D)  9.75" from upper mounts to top of firewall
E)  4.75" from lower mounts to bottom of firewall
F) 12.00"
G)  5.00"
H) 28.25" top of firewall to corner
I) 30.25" firewall at widest point inline with top mounts

For a Lyc. 0-360 180 hp the plans call for an 11" long engine mount.
I have measured two installations:
A) an 0-360 that is 33" from firewall to prop flange and
B) an 0-320 that is 33.75" from firewall to prop flange

You will just have to make your best guess at mount length. I will
probably build a "corrected" 2nd mount after weight and balance.
This is a n/a engine with a dry sump oil system using a 2.85:1
redrive and approx. 220 hp.

Shoehorn what you can in front of this firewall. If I have to modify
the firewall dimensions some what that is not a problem. I will be
building a custom cowl so put radiator and engine air inlets where
you think best along with exhaust louvers if possible.
Did you consider doing a part 1 and part 11 cooling seminar at
Oshkosh? If I am going to have any problems with this installation I
think cooling will be it, I need to learn all I can about the
possibilities.
Thank you very much,
Randy


Here are a few 3D's and a side view. Apparently the dwg background
is rotated slightly so I assumed the firewall was vertical
and the fuse was aligned to match.

The bare engine weight is 190 pounds. Tracy's PSRU is 45
pounds. The starter is 8 pounds and the alternator is 10.5 pounds.
The motor mount is probably less than ten pounds.
Take a guess on the CG position of the various parts and
calculate the weight and balance

Paul Lamar ...No rotor no motor.

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